Swift Trail Junction, Arizona has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 48.4 °F (low) to 80.8 °F (high). Annual precipitation averages 9.6 Inches. Swift Trail Junction is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 30.7 °F | 61.3 °F | 0.78 in. |
| February | 34.1 °F | 65.9 °F | 0.77 in. |
| March | 39.3 °F | 72.8 °F | 0.54 in. |
| April | 44.6 °F | 80.9 °F | 0.26 in. |
| May | 53.1 °F | 89.8 °F | 0.21 in. |
| June | 62.6 °F | 98.4 °F | 0.25 in. |
| July | 69.5 °F | 98.3 °F | 1.62 in. |
| August | 68.1 °F | 95.9 °F | 1.93 in. |
| September | 61.6 °F | 91.9 °F | 1.11 in. |
| October | 48.8 °F | 83.5 °F | 0.68 in. |
| November | 37.5 °F | 70.8 °F | 0.53 in. |
| December | 30.9 °F | 60.3 °F | 0.91 in. |
| Annual | 48.4 °F | 80.8 °F | 9.59 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BWk - Cold Desert Climate |